:orphan:

.. title:: MCUMGR_BUF_USER_DATA_SIZE

.. option:: CONFIG_MCUMGR_BUF_USER_DATA_SIZE

*Size of mcumgr buffer user data*

Type: ``int``

Help
====

The size, in bytes, of user data to allocate for each mcumgr buffer.

Different mcumgr transports impose different requirements for this
setting. A value of 4 is sufficient for UART, shell, and bluetooth.
For UDP, the userdata must be large enough to hold a IPv4/IPv6 address.

Note that CONFIG_NET_BUF_USER_DATA_SIZE must be at least as big as
MCUMGR_BUF_USER_DATA_SIZE.

Direct dependencies
===================

\ :option:`MCUMGR <CONFIG_MCUMGR>`

*(Includes any dependencies from ifs and menus.)*

Defaults
========

- 24 if \ :option:`MCUMGR_SMP_UDP <CONFIG_MCUMGR_SMP_UDP>` && \ :option:`MCUMGR_SMP_UDP_IPV6 <CONFIG_MCUMGR_SMP_UDP_IPV6>`
- 8 if \ :option:`MCUMGR_SMP_UDP <CONFIG_MCUMGR_SMP_UDP>` && \ :option:`MCUMGR_SMP_UDP_IPV4 <CONFIG_MCUMGR_SMP_UDP_IPV4>`
- 4

Kconfig definition
==================

.. highlight:: kconfig

At ``subsys/mgmt/mcumgr/Kconfig:361``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:34`` → ``subsys/Kconfig:35`` → ``subsys/mgmt/Kconfig:9``

Menu path: (Top) → Sub Systems and OS Services → Device Management → mcumgr Support

.. parsed-literal::

    config MCUMGR_BUF_USER_DATA_SIZE
    	int "Size of mcumgr buffer user data"
    	default 24 if \ :option:`MCUMGR_SMP_UDP <CONFIG_MCUMGR_SMP_UDP>` && \ :option:`MCUMGR_SMP_UDP_IPV6 <CONFIG_MCUMGR_SMP_UDP_IPV6>`
    	default 8 if \ :option:`MCUMGR_SMP_UDP <CONFIG_MCUMGR_SMP_UDP>` && \ :option:`MCUMGR_SMP_UDP_IPV4 <CONFIG_MCUMGR_SMP_UDP_IPV4>`
    	default 4
    	depends on \ :option:`MCUMGR <CONFIG_MCUMGR>`
    	help
    	  The size, in bytes, of user data to allocate for each mcumgr buffer.
	  
    	  Different mcumgr transports impose different requirements for this
    	  setting. A value of 4 is sufficient for UART, shell, and bluetooth.
    	  For UDP, the userdata must be large enough to hold a IPv4/IPv6 address.
	  
    	  Note that CONFIG_NET_BUF_USER_DATA_SIZE must be at least as big as
    	  MCUMGR_BUF_USER_DATA_SIZE.

*(The 'depends on' condition includes propagated dependencies from ifs and menus.)*